Param Decoder

This lib is built to get request query params and deserialize in structs in the easiest way.

How to install

Add at your project with the command

Latest version

go get github.com/marcoscouto/param-decoder

Specific version

go get github.com/marcoscouto/[email protected]

How to use

To use the lib you need to create a struct with public attributes and with the supported types.

type Params struct {
	ID        string    `query:"id"`
	Name      string    `query:"name"`
	CreatedAt time.Time `query:"created_at"`
	Age       int32     `query:"age"`
	Balance   float32   `query:"balance"`
	Verified  bool      `query:"verified"`
	Names     []string  `query:"names"`
	Ages      []int32   `query:"ages"`
	Balances  []float32 `query:"balances"`
	Verifieds []bool    `query:"verifieds"`
}

Import in the file that will use

decoder "github.com/marcoscouto/param-decoder"

Call the method and insert the struct type in generics field.

params := decoder.DecodeQueryParams[Params](r.URL.Query())

The method will return a Params struct with the values from query. If the value is empty in query parameter, the struct will return the default value of type.

Supported types

• string
• bool
• time.Time
• int int, int8, int16, int32, int64
• uint uint, uint8, uint16, uint32, uint64
• float float32, float64
• slices string, int, uint, float, bool

Full Example

main.go

package main

import (
	"encoding/json"
	"net/http"
	"time"

	"github.com/gorilla/mux"
	decoder "github.com/marcoscouto/param-decoder"
)

const (
	ContentType     = "Content-Type"
	ApplicationJson = "application/json"
)

func main() {
	r := mux.NewRouter()
	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		params := decoder.DecodeQueryParams[Params](r.URL.Query())
		marshal, _ := json.Marshal(params)
		w.Header().Set(ContentType, ApplicationJson)
		w.Write(marshal)
	})
	http.ListenAndServe(":3000", r)
}

type Params struct {
	ID        string    `query:"id"`
	Name      string    `query:"name"`
	CreatedAt time.Time `query:"created_at"`
	Age       int32     `query:"age"`
	Balance   float32   `query:"balance"`
	Verified  bool      `query:"verified"`
	Names     []string  `query:"names"`
	Ages      []int32   `query:"ages"`
	Balances  []float32 `query:"balances"`
	Verifieds []bool    `query:"verifieds"`
}

cURL

curl --location 'http://localhost:3000?name=some_name&id=some_id&age=99&created_at=2024-01-05T12%3A13%3A14Z&balance=10.11&verified=true&ages=1%2C2%2C3&balances=1.1%2C2.2%2C3.3&verifieds=true%2Cfalse%2Ctrue&names=a%2Cb%2Cc'